diff --git a/packages/hydrooj/src/entry/common.ts b/packages/hydrooj/src/entry/common.ts
index 20fb1c4d2..73467f115 100644
--- a/packages/hydrooj/src/entry/common.ts
+++ b/packages/hydrooj/src/entry/common.ts
@@ -68,7 +68,7 @@ export async function builtinModel(ctx: Context) {
 }
 
 export async function locale(pending: string[], fail: string[]) {
-    await Promise.all(pending.map(async (i) => {
+    for (const i of pending) {
         const p = locateFile(i, ['locale', 'locales']);
         if (p && (await fs.stat(p)).isDirectory() && !fail.includes(i)) {
             try {
@@ -86,7 +86,7 @@ export async function locale(pending: string[], fail: string[]) {
                 logger.error(e);
             }
         }
-    }));
+    }
     await bus.parallel('app/load/locale');
 }
 
diff --git a/packages/hydrooj/src/service/watcher.ts b/packages/hydrooj/src/service/watcher.ts
index f5073e6e5..2c268e150 100644
--- a/packages/hydrooj/src/service/watcher.ts
+++ b/packages/hydrooj/src/service/watcher.ts
@@ -152,7 +152,7 @@ export default class Watcher extends Service {
         for (const filename in require.cache) {
             const module = require.cache[filename];
             const plugin = unwrapExports(module.exports);
-            if (!(typeof plugin === 'object' && 'apply' in plugin)) continue;
+            if (!(typeof plugin === 'object' && plugin && 'apply' in plugin)) continue;
             const runtime = this.ctx.registry.get(plugin);
             if (!runtime || this.declined.has(filename)) continue;
             pending.set(filename, runtime);